<span>Whitman gets up and walks out of the lecture hall because he is tired of all the words, numbers, and technicalities about stars and he just goes outside and looks at the stars in the night sky and that is all he needs psychically. It ties in with Emerson's transcendental idea that man is (or should be) just a big eye ball who observes and experiences but try to dominate or interfere.</span>
"All men are created / born equal" is probably the best quote because it implies equality and all men are seen as the same in the eyes of God. This "condemns" slavery because it suggests there is no superiority/inferiority to others.